Abstract:In the present paper, a new approach to rapid determination of compound fertilizer composition was introduced, namely first preparing aqueous solution of solid fertilizer, then predicting the compound fertilizer composition using the near infrared transmission spectra of the solution. Using the new method, models were built by means of PLS regression, and the standard errors of prediction of total nitrogen content, P2O5 content, and K2O content are 0.5, 0.7, 0.8, and 2.0, respectively. This has solved the problem of large prediction error for K content of compound fertilizer using near infrared reflectance spectroscopy due to the fact that KCl dose not have near infrared absorption, and achieved rapid analysis of all compositions of compound fertilizer in 5 minutes.
[1] GB 15063—2009 Compound Fertilizer(复合肥料). Gtenaral Administation of Supervision, Inspection Quarantine of China(国家质量监督检验检疫总局), 2009. [2] GB/T 8572—2001 Determination of Total Nitrogen Content for Compound Fertilizer—Titrimetric Method after Distillation(复混肥料中总氮含量的测定—蒸馏后滴定法). Gtenaral Administation of Supervision, Inspection Quarantine of China(国家质量监督检验检疫总局), 2001. [3] GB/T 8573—1999 Determination of Available Phosphorus Content for Compound Fertilizers(复混肥料中有效磷含量的测定). Gtenaral Administation of Supervision, Inspection Quarantine of China(国家质量监督检验检疫总局), 1999. [4] GB/T 8574—2002 Determination of Potassium Content for Compound Fertilizers Potassium Tetraphenylborate Gravimetric Method(复混肥料中钾含量的测定—四苯硼酸钾重量法). Gtenaral Administation of Supervision, Inspection Quarantine of China(国家质量监督检验检疫总局), 2002. [5] LU Wan-zhen,YUAN Hong-fu,XU Guang-tong(陆婉珍,袁洪福,徐广通). The Modern Analysis Technique for Near-Infrared Spectra(现代近红外光谱分析技术). Beijing: Chinese Oil and Chemical Press(北京:中国石油化工出版社),2001. [6] Jerry W,Lois W. Practical Guide to Interpretive Near-Infrared Spectroscopy(近红外光谱解析实用指南). Translated by CHU Xiao-li,XU Yu-peng,TIAN Gao-you(褚小立,许育鹏,田高友,译). Beijing:Chemical Industry Press(北京:化学工业出版社),2009. 57.